TM10-3930-660-34 16-15.   EXTEND AND RETRACT CHAINS - REPLAC  (Cont’d) 2. REMOVE EXTEND CHAIN (6). a. Tie a rope of suitable length to end of extend chain (6), just behind clevis (12). b. Tie other end of rope to clevis (12) mounting hole. NOTE Leave rope inside boom after removing extend chain (6). The rope will be used to pull new extend chain (6) through boom assembly. c. Pull extend chain (6) out from back of boom. Remove rope from chain (6). d. Remove two retaining rings (13), pin (14) and clevis (12).  Separate extend chain (6) from clevis (12). RETRACT CRAIN REMOVAL 1.  REMOVE INNER BOOM, PARA.  16-12.1. 2.  REMOVE COTTER PIN (15) AND CLEVIS PIN (16). DISCARD COTTER PIN (15). 3.  REMOVE RETAINING RING (17), PIN (18), CLEVIS (19) TO DISCONNECT RETRACT CHAIN (20).  REMOVE RETAINING RING (21) FROM PIN (18), IF NECESSARY. 16-95